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Cable Locking And Sealing Process For Sensor - Patent 5351388


The present invention is directed to an improved cable locking and sealing process for asensor and more specifically to a moisture proof sensor and a process for making such sensor which is used to sense vibration of rotating machinery, temperature sensing and other purposes.BACKGROUND OF THE INVENTIONFor sensing the vibration of motor shafts, for example, of large rotating machinery, a proximity sensor is utilized. Such a sensor has a metal case which contains a sensing coil at one end and has a shielded cable extending out from the otherend of the case for connecting to an electrical processing unit. By well known techniques, excessive movement of the shaft indicating unwanted vibration can be sensed. This provides an indication of incipient problems. Such a system with a proximitysensor is at the present time being sold by the assignee of this application, Bently Nevada Corporation of Minden, Nev.Because of the very adverse ambient conditions such sensor operates under, it must be resistant to heat and moisture and also withstand mechanical stresses such as pulling or twisting on the shielded cable. One sensor which is sold at thepresent time by the assignee of this application is shown and described in the process patent U.S. Pat. No. 5,016,343 and apparatus patent U.S. Pat. No. 5,021,737.OBJECTS AND SUMMARY OF THE INVENTIONIt is a general object of the present invention to provide an improved sensor and a method of making such sensor.In accordance with the above object there is provided a process for making a sensor with a sensing coil at one end having at least one lead and a shielded cable extending out of the other end for connecting to an electrical processing unit, thecable having an outer insulating jacket and an outer shielding conductor surrounding an inner insulator carrying at least one interior conductor. The process comprises the steps of trimming an end of the cable so that the jacket and outer shieldingconductor is cut away to expose an

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